/*-
* Copyright (c) 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Chris Torek.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifdefVARIANT_DARWINEXTSN
#define_DARWIN_UNLIMITED_STREAMS
#defineCOUNT 0
#elifdefined(VARIANT_LEGACY)
#defineCOUNT 0
#else
#defineCOUNT 1
#endif
#ifdefined(LIBC_SCCS) && !defined(lint)
staticchar sccsid[] = "@(#)fopen.c 8.1 (Berkeley) 6/4/93";
#endif/* LIBC_SCCS and not lint */
#include<sys/cdefs.h>__FBSDID("$FreeBSD: src/lib/libc/stdio/fopen.c,v 1.14 2008/04/22 17:03:32 jhb Exp $");
#include"namespace.h"
#include<sys/types.h>
#include<sys/stat.h>
#include<fcntl.h>
#include<unistd.h>
#include<stdio.h>
#include<errno.h>
#include<limits.h>
#include"un-namespace.h"
#include"local.h"
FILE *
fopen(file, mode)
constchar * __restrict file;
constchar * __restrict mode;
{
FILE *fp;
int f;
int flags, oflags;
if ((flags = __sflags(mode, &oflags)) == 0)
return (NULL);
if ((fp = __sfp(COUNT)) == NULL)
return (NULL);
if ((f = _open(file, oflags, DEFFILEMODE)) < 0) {
__sfprelease(fp); /* release */return (NULL);
}
/*
* File descriptors are a full int, but _file is only a short.
* If we get a valid file descriptor that is greater than
* SHRT_MAX, then the fd will get sign-extended into an
* invalid file descriptor. Handle this case by failing the
* open.
*/if (f > SHRT_MAX) {
fp->_flags = 0; /* release */
_close(f);
errno = EMFILE;
return (NULL);
}
fp->_file = f;
fp->_flags = flags;
fp->_cookie = fp;
fp->_read = __sread;
fp->_write = __swrite;
fp->_seek = __sseek;
fp->_close = __sclose;
/*
* When opening in append mode, even though we use O_APPEND,
* we need to seek to the end so that ftell() gets the right
* answer. If the user then alters the seek pointer, or
* the file extends, this will fail, but there is not much
* we can do about this. (We could set __SAPP and check in
* fseek and ftell.)
*/if (oflags & O_APPEND)
(void)_sseek(fp, (fpos_t)0, SEEK_END);
return (fp);
}